Remove more of the std::experimental bits that are now in std::. All the _v...

Remove more of the std::experimental bits that are now in std::. All the _v type aliases, conjunction/disjunction, apply, etc. See https://libcxx.llvm.org/TS_deprecation.html

git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@324423 91177308-0d34-0410-b5e6-96231b3b80d8